adding a deploy workflow

.github/workflows/main.yml

@@ -0,0 +1,25 @@
+name: CI
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: install dependencies
+        run: sudo apt-get install -y discount make gcc
+      - name: checkout
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 1
+      - name: cd repo
+        run: cd ${{ github.workspace }}
+      - name: build
+        run: make
+      - name: deploy
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: "${{ github.workspace }}/public"